Malicious PDF — malware analysis report

Static analysis result for SHA-256 3814353018a8153b…

MALICIOUS

PDF

97.0 KB Created: 2021-08-02 05:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f054c466f016b7fa09358c380eecc59d SHA-1: 6ed7e0e6acee1c9574e2f162237351c5be2bb59e SHA-256: 3814353018a8153bd5bcfe748beca133b2907d63d6743363b574cecb94d057d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it's likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kanchanaspa.com/ckfinder/userfiles/files/29061953776.pdf In PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/2a6be4734fd2cb7e0037e4a5823d73d4/32227006386.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/32068821198.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/19cbb2941d328117e0af1fb768ee439f/gidixenamisufedejakopuno.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/8a6f5bb5e715d6a270cd28dd824d8279/5638371142.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090cfbcc53df---57389783491.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/35121393754.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xepaj.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9eb1d39e07c8ce44b7e8336891669586/98929871076.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/12584938694.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e5aa0d3f54337f4d1648b231dd4ed8f9/vosolomarojejupam.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a789c02c8---12344303016.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/12796675338.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/6522957039.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608459a625cd2---popuj.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/kutuxidapiziburo.pdfIn PDF document text
    • http://e-hematologica.com/users//file/liwon.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64e813971ac764cf0d664c56d70da408/gikerutixa.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/648139944.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/9si4n27rr963koloelekh3vl3b/xetulizisititilafekisegeg.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/zuvodubobuvavawedura.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fd06ht5b5o022cv34gnbtjak32/velutuvubekejidivuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manual+del+usuario+pointer+2005PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 18616 bytes
SHA-256: 1a79c8b96672570541cc3f193db74472588f2bd49bf725813df3b29fb2232034
font_01_sfnt_off000143ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C01 10856 bytes
SHA-256: 136838b4942ede972718f59ae43ce8aceab6f21da433524fe9c91d614aa594cb

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